Man revisiting thread makes me want to do this but it seems like no one tried it on a 328i. If anyone has connection on where to get the manifold used please post it on here. I found a 2005 manifold for a decent price. Will a 2005 330i manifold work? I actually might pull this off....finally grew some balls!! lol

Wait, you're in the US. 2005 330 was an e46 2-stage manifold that was vacuum operated. It won't work on an e90.